What is the longest wavelength of light that will
emitelectrons from a metal whose work function is 3.10 ev?

The longest wavelength equals

Explanation:

According to Einstein's photoelectric equation we have

where

is the energy of the incident light

is the work function of the metal

The incident energy of the light with wavelength is given by

Thus the photoelectric equation reduces to

Thus applying values we get

Hence The longest wavelength equals

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